APA (7th ed.) Citation

Helfer, J. R. (1949). How to know the grasshoppers, cockroaches, and thier allies. Wm. C. Brown.

Chicago Style (17th ed.) Citation

Helfer, Jacques R. How to Know the Grasshoppers, Cockroaches, and Thier Allies. Iowa: Wm. C. Brown, 1949.

MLA (9th ed.) Citation

Helfer, Jacques R. How to Know the Grasshoppers, Cockroaches, and Thier Allies. Wm. C. Brown, 1949.

Warning: These citations may not always be 100% accurate.